Apple Header

• https://opensource.apple.com/source/Security/Security-55471/sec/Security/SecBasePriv.h
• errSecMissingEntitlement = -34018, /* Internal error when a required entitlement isn't present. */
• above error appears to be misleading, as this error does seem to be related to throttling - see twitter link below

Stackoverflow

• https://stackoverflow.com/questions/20344255/secitemadd-and-secitemcopymatching-returns-error-code-34018-errsecmissingentit

SSKeychain Github Issue Open

• https://github.com/soffes/sskeychain/issues/52

Dev Forums

• https://devforums.apple.com/message/917498#917498

• https://devforums.apple.com/message/973706#973706

Twitter

• https://twitter.com/liquidx/status/515326532643196928

@irace its likely because you are reading from the keychain too frequently and the secure enclave is throttling.